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Homework Due: #7-15, 17-20 Turn in your HW!!! Tonight’s HW:

Homework Due: #7-15, 17-20 Turn in your HW!!! Tonight’s HW: TEST next class on Ch 10 & 11…STUDY!!! Do Now: Take a Do NOW from my desk. Take a clicker . .

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Homework Due: #7-15, 17-20 Turn in your HW!!! Tonight’s HW:

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  1. Homework Due: #7-15, 17-20 • Turn in your HW!!! • Tonight’s HW: • TEST next class on Ch 10 & 11…STUDY!!! • Do Now: • Take aDo NOW from my desk. • Take a clicker.

  2. Which hoop will reach the bottom of a ramp first? They are the same mass, released on the same ramp at the same time from the same height.(the hoops are on my desk if you want to pick them up/ look at them!) • Hoop 1 • Hoop 2 • Hoop 3 • Hoop 1 &2 • Hoop 2 & 3 • Hoop 1 & 3 • All 3 @ the Same time • Not sure/ not enough info The CLOSER the bulk of the mass is from the turning axis, the LESS R.I. there is!!! It is EASY to get #2to ROTATE since it DOESN’T RESIST CHANGE!

  3. The 3 batons below have the SAME mass, but the mass is distributed differently. The 1st baton has most of the mass close to the handle. The 2nd baton has most of the mass far from the handle. The 3rd baton has the mass evenly distributed from the handle. Which has the GREATEST rotational inertia? The farther the bulk of the mass is from the turning axis, the MORE R.I. there is!!!

  4. The 3 batons below have the SAME mass, but the mass is distributed differently. The 1st baton has most of the mass close to the handle. The 2nd baton has most of the mass far from the handle. The 3rd baton has the mass evenly distributed from the handle. Which is the EASIEST to balance? The farther the bulk of the mass is from the turning axis, the MORE R.I. there is!!! It WANTS to STAY balanced since it RESISTS CHANGE!

  5. The 3 batons below have the SAME mass, but the mass is distributed differently. The 1st baton has most of the mass close to the handle. The 2nd baton has most of the mass far from the handle. The 3rd baton has the mass evenly distributed from the handle. Which is the EASIEST to swing like a bat? The CLOSER the bulk of the mass is from the turning axis, the LESS R.I. there is!!! It is EASY to get it to ROTATE since it DOESN’T RESIST CHANGE!

  6. BASEBALL PLAYERS CHOKE UP ON A BAT TO….. The CLOSER the bulk of the mass is from the turning axis, the LESS R.I. there is!!! Choking Up means more mass is CLOSER to the turning point, making it EASY to get the bat swinging since it is LESS RESISTANT TO CHANGE! • INCREASE the R.I. and make it easier to get the bat swinging • DECREASE the R.I. and make it easier to get the bat swinging • Not quite sure

  7. TODAY’S GOALS: • Finish the POGIL #2 from last class • Work efficiently – check in at stop signs • Must be finished today! (not being collected, but test is next class!) • Go over the HW due today • Questions? Ask! • Take back your CH 10 Quiz • Make corrections!!! This will be on your test! • Prep for next class’ test by reviewing your: • Ch 10 & 11…HW…POGILS…Ch10 Quiz • Finish your Study Guide by 11:55 for +5! • We are stopping with 5 minutes left for a clicker exit

  8. Based on rotational inertia concepts… does your back pack FEEL lighter if the heaviest books are located…a. father from your back?orb. closer to your back?WHY? A B • A • B • SAME in both Closer to your back = less R.I. = less resistance… Feels lighter because the books don’t really “care” if they fall down or not!

  9. Look at Figure 4. A man is spinning on a rotating turn table [A]. Then, he brings his arms in closer to his body. In which image does the man have the greater ROTATIONAL INERTIA? • A • B • SAME in both

  10. Look at Figure 4. A man is spinning on a rotating turn table [A]. Then, he brings his arms in closer to his body. In which image does the man have the greater ROTATIONAL velocity? • A • B • SAME in both

  11. Look at Figure 4. A man is spinning on a rotating turn table [A]. Then, he brings his arms in closer to his body. In which image does the man have the greater ANGULAR MOMENTUM? • A • B • SAME in both

  12. Look at Figure 4. A man is spinning on a rotating turn table [A]. Then, he brings his arms in closer to his body. A B RI. ω= Angular Momentum = RI . ω

  13. Exit! • Return your clickers • TEST on Ch. 10 & 11 NEXT CLASS - - study!!! • 2nd to last test for the YEAR and worth 104 points! • This can make or break your 4th MP grade!

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